Do this routine before every shower: 50 jumping jacks, 5 pushups, 20 crunches, 20 mountain climbers, and 30 second plank. I like the idea of doing it before every shower, then it is easier to become part of a routine
Treadmill intervals to burn belly fat - totally doable...highest speed is 7 mph. Great template and you can increase speed/incline/time based on your ability and progress. Running really is great core work, and it burns fat. No one can see your abs if they're covered in fat (duh).